Clearly Mrs Harb was seen as a potential source of embarrassment. That is well illustrated by the fact that on the 1st March 2001 an undisclosed principal (in reality the King) had paid Mrs Harb a very substantial sum for entering into a binding deed of confidentiality covering all aspects of her past relationship with the King.

I wonder why she was seen as an embarrassment.

A quick google for 'Janan Harb' reveals that one Janan Harb is a Scientologist.

Now, I have no way of knowing if this is indeed the same Janan Harb. But I would imagine that it could be very embarrassing for the defender of the Holy Places of Islam if his wife had converted away from Islam (apostasy) to become a Scientologist. If, of course, that is in fact what happened, of which I have no way of knowing.